Error: "The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel"

This error is because the Galaxkey client cannot establish a trust relationship with the server and happens when an SSL inspection proxy is in between and provides it's own certificate on behalf of the Galaxkey server. Galaxkey does not allow this.

Once you confirm that you are behind an SSL inspection proxy, add the following exceptions to it:

*.galaxkey.com
galaxkeyeu.s3-eu-west-1.amazonaws.com

Galaxkey can provide the IP address on request. Please contact Galaxkey Support for your requirement.